Control validation on dynaforms

I using struts 1.3.8 to build a pretty simple application. I use one dispatch action, one jsp-form for both the update and the create,a DynaValidatorForm och struts validation configured in xml.

The update flow works well, however the create flow does not. Reason is that the validation kicks in just by going to the form, and I get errors on all the "required" fields since they are empty.

So is there anyway to stop the validation from running? I looked into using DynaActionForm and manually calling validate, however validate is not implemented for DynaActionForm(!) Removing required validation from the validation.xml into code might work. But can't find a way to create ActionError anymore so would end up using ActionMessage to display validation errors.